<template>
    <div class="M-Flipper" :class="[flipType, { 'go': isFlipping }]">
        <div class="digital front" :class="_textClass(frontTextFromData)"></div>
        <div class="digital back" :class="_textClass(backTextFromData)"></div>
    </div>
</template>

<script setup lang="ts">
import { ref, defineProps, defineExpose } from 'vue';

const props = defineProps({
    frontText: {
        type: [Number, String],
        default: 0
    },
    backText: {
        type: [Number, String],
        default: 1
    },
    duration: {
        type: Number,
        default: 600
    }
});

const isFlipping = ref(false);
const flipType = ref('down');
const frontTextFromData = ref(props.frontText);
const backTextFromData = ref(props.backText);

const _textClass = (number: number | string) => {
    return 'number' + number;
};

const _flip = (type: string, front: number | string, back: number | string) => {
    if (isFlipping.value) return;
    frontTextFromData.value = front;
    backTextFromData.value = back;
    flipType.value = type;
    isFlipping.value = true;
    setTimeout(() => {
        isFlipping.value = false;
        frontTextFromData.value = back;
    }, props.duration);
};

const flipDown = (front: number | string, back: number | string) => {
    _flip('down', front, back);
};

const flipUp = (front: number | string, back: number | string) => {
    _flip('up', front, back);
};

const setFront = (text: number | string) => {
    frontTextFromData.value = text;
};

const setBack = (text: number | string) => {
    backTextFromData.value = text;
};

defineExpose({ flipDown, flipUp, setFront, setBack });
</script>

<style>
.M-Flipper {
    display: inline-block;
    position: relative;
    width: 2.5rem;
    height: 4.5rem;
    line-height: 4.5rem;
    border: solid 1px #000;
    border-radius: 10px;
    background: #fff;
    font-size: 3rem;
    color: #fff;
    box-shadow: 0 0 6px rgba(0, 0, 0, 0.5);
    text-align: center;
    font-family: 'Helvetica Neue';
}

.M-Flipper .digital:before,
.M-Flipper .digital:after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    background: #000;
    overflow: hidden;
    box-sizing: border-box;
}

.M-Flipper .digital:before {
    top: 0;
    bottom: 50%;
    border-radius: 10px 10px 0 0;
    border-bottom: solid 1px #666;
}

.M-Flipper .digital:after {
    top: 50%;
    bottom: 0;
    border-radius: 0 0 10px 10px;
    line-height: 0;
}

/*向下翻*/
.M-Flipper.down .front:before {
    z-index: 3;
}

.M-Flipper.down .back:after {
    z-index: 2;
    transform-origin: 50% 0%;
    transform: perspective(160px) rotateX(180deg);
}

.M-Flipper.down .front:after,
.M-Flipper.down .back:before {
    z-index: 1;
}

.M-Flipper.down.go .front:before {
    transform-origin: 50% 100%;
    animation: frontFlipDown 0.6s ease-in-out both;
    box-shadow: 0 -2px 6px rgba(255, 255, 255, 0.3);
    backface-visibility: hidden;
}

.M-Flipper.down.go .back:after {
    animation: backFlipDown 0.6s ease-in-out both;
}

/*向上翻*/
.M-Flipper.up .front:after {
    z-index: 3;
}

.M-Flipper.up .back:before {
    z-index: 2;
    transform-origin: 50% 100%;
    transform: perspective(160px) rotateX(-180deg);
}

.M-Flipper.up .front:before,
.M-Flipper.up .back:after {
    z-index: 1;
}

.M-Flipper.up.go .front:after {
    transform-origin: 50% 0;
    animation: frontFlipUp 0.6s ease-in-out both;
    box-shadow: 0 2px 6px rgba(255, 255, 255, 0.3);
    backface-visibility: hidden;
}

.M-Flipper.up.go .back:before {
    animation: backFlipUp 0.6s ease-in-out both;
}

@keyframes frontFlipDown {
    0% {
        transform: perspective(160px) rotateX(0deg);
    }

    100% {
        transform: perspective(160px) rotateX(-180deg);
    }
}

@keyframes backFlipDown {
    0% {
        transform: perspective(160px) rotateX(180deg);
    }

    100% {
        transform: perspective(160px) rotateX(0deg);
    }
}

@keyframes frontFlipUp {
    0% {
        transform: perspective(160px) rotateX(0deg);
    }

    100% {
        transform: perspective(160px) rotateX(180deg);
    }
}

@keyframes backFlipUp {
    0% {
        transform: perspective(160px) rotateX(-180deg);
    }

    100% {
        transform: perspective(160px) rotateX(0deg);
    }
}

.M-Flipper .number0:before,
.M-Flipper .number0:after {
    content: '0';
}

.M-Flipper .number1:before,
.M-Flipper .number1:after {
    content: '1';
}

.M-Flipper .number2:before,
.M-Flipper .number2:after {
    content: '2';
}

.M-Flipper .number3:before,
.M-Flipper .number3:after {
    content: '3';
}

.M-Flipper .number4:before,
.M-Flipper .number4:after {
    content: '4';
}

.M-Flipper .number5:before,
.M-Flipper .number5:after {
    content: '5';
}

.M-Flipper .number6:before,
.M-Flipper .number6:after {
    content: '6';
}

.M-Flipper .number7:before,
.M-Flipper .number7:after {
    content: '7';
}

.M-Flipper .number8:before,
.M-Flipper .number8:after {
    content: '8';
}

.M-Flipper .number9:before,
.M-Flipper .number9:after {
    content: '9';
}
</style>